Modelling temperature effects on ammonia-oxidising bacterial biostability in chloraminated systems
MetadataShow full item record
The biostability concept has been successfully used to predict the onset of nitrification in drinking water distribution systems, but in certain cases deficiencies have been observed in the predictions, indicating that modifications to parameters were needed. At the biostable disinfectant residual concentration (BRC), the rate of ammonia-oxidising bacterial (AOB) growth due to the substrate (free ammonia) and the rate of inactivation due to the disinfectant are balanced. Growth and inactivation rates vary greatly with temperature, but temperature is yet to be considered in the biostability equation. In this paper, two separate novel models are proposed which take into account the temperature effects on the biostability equation. First, a novel model of specific growth rate variability with temperature was shown to be valid for different bacterial species. Then, the biostability model was modified and validated for ammonia-oxidising bacterial activity using data collected from laboratory and full-scale distribution systems. The proposed model has two important uses: while the specific growth rate model and biostability model can be widely adopted for many microbes, the biostability model for AOB also has the potential to aid water utilities in disinfectant residual management throughout yearly temperature variations.
Showing items related by title, author, creator and subject.
Sarker, Dipok; Sathasivan, Arumugam (2011)Controlling nitrification is a challenge as the causes of onset of severe nitrification in chloraminated distribution systems are not yet well identified. Biostability concept is recently introduced to define the conditions ...
An investigation of the physiological and biochemical responses elicited by Panulirus cygnus to harvesting, holding and live transport.Spanoghe, Patrick T. (1996)The western rock lobster (WRL), Panulirus cygnus is a decapod crustacean which is found in abundance in the coastal waters of Western Australia and which supports a major fishery of economic importance for the State, with ...
Liu, Shaomin; Chu, L.; Zhu, J. (2014)The immobilized microbial beads were prepared to treat ammonia-nitrogen in domestic sewage, which is made from entrapping nitrobacteria with the polyvinyl alcohol-sodium alginate as entrapment carriers. In order to study ...